Despite the thread title, my goal here is to discuss if a defensive Weezing made to physical walling can afford the loss of WoW and STAB for a better coverage, here what I suggest:
Weezing @leftovers
252 HP, 252 Def, 6 Sp.Atk
- Flamethrower
- Thunderbolt
- Hidden Power Ice
- Pain Split
Now there's nothing to complain about. You can take steel types and Heracross with Flamethrower, Gyarados with TBolt, and Chomp/Mence/Nite with HP Ice.
Pain Split is a need, otherwise you won't be able to take many hits, so maybe it's better to give up STAB for threat coverage and I'm still in doubt about WoW. Can the floating balls afford the loss of the burning inducer move? Discuss.

Weezing @leftovers
252 HP, 252 Def, 6 Sp.Atk
- Flamethrower
- Thunderbolt
- Hidden Power Ice
- Pain Split
Now there's nothing to complain about. You can take steel types and Heracross with Flamethrower, Gyarados with TBolt, and Chomp/Mence/Nite with HP Ice.
Pain Split is a need, otherwise you won't be able to take many hits, so maybe it's better to give up STAB for threat coverage and I'm still in doubt about WoW. Can the floating balls afford the loss of the burning inducer move? Discuss.